EP4311174A1 - Method for determining phase noise and related device - Google Patents

Method for determining phase noise and related device Download PDF

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Publication number
EP4311174A1
EP4311174A1 EP22778816.3A EP22778816A EP4311174A1 EP 4311174 A1 EP4311174 A1 EP 4311174A1 EP 22778816 A EP22778816 A EP 22778816A EP 4311174 A1 EP4311174 A1 EP 4311174A1
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EP
European Patent Office
Prior art keywords
signal
value
communication apparatus
ptrs
interference
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EP22778816.3A
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German (de)
English (en)
French (fr)
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EP4311174A4 (en
Inventor
Qianli Ma
Nuwan Suresh Ferdinand
Huang Huang
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication of EP4311174A1 publication Critical patent/EP4311174A1/en
Publication of EP4311174A4 publication Critical patent/EP4311174A4/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2675—Pilot or known symbols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
    • H04L27/2636—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2649—Demodulators
    • H04L27/26524—Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation
    • H04L27/26526—Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation with inverse FFT [IFFT] or inverse DFT [IDFT] demodulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] receiver or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]

Definitions

  • This application relates to the field of communication technologies, and in particular, to a phase noise determining method and a related apparatus.
  • a high frequency (a frequency band higher than 6 GHz, mainly including 28 GHz, 39 GHz, 60 GHz, 73 GHz, and the like) has become a research and development hotspot in the industry to meet increasing communication requirements due to abundant frequency band resources of the high frequency.
  • the high frequency may provide an antenna array with high bandwidth and high integration for communication to achieve a high throughput.
  • a phase noise (phase noise, PHN) problem of the high frequency band is excessively prominent.
  • a phase-tracking reference signal Phase-Tracking Reference Signal, PTRS
  • PTRS Phase-Tracking Reference Signal
  • a corresponding optimization design may be performed on a filter of a receiving device.
  • a designed filter is a non-Nyquist (Nyquist) filter. Because the non-Nyquist filter introduces inter-symbol interference of adjacent code elements in a signal, the introduction of the non-Nyquist filter causes ineffective determining of phase noise.
  • This application provides a phase noise determining method and a related apparatus, to effectively determine phase noise in a signal.
  • this application provides a phase noise determining method.
  • the method includes: A first communication apparatus obtains a first signal, where the first signal includes a data signal and K phase-tracking reference signals PTRSs. A value of an m th PTRS in the K PTRSs is determined based on a value of first interference, a value of second interference, and a preset receiving value of the m th PTRS, the first interference is inter-symbol interference generated by the data signal on the m th PTRS, the second interference is inter-symbol interference generated by a PTRS other than the m th PTRS in the K PTRSs on the m th PTRS, K and m are positive integers, and 1 ⁇ m ⁇ K.
  • the first communication apparatus sends a second signal to a second communication apparatus, where the second signal is a signal obtained through baseband signal processing performed on the first signal.
  • values of the K PTRSs in the first signal may be preprocessed, so that under an assumed condition that there is no phase noise, a value of a PTRS received by a receive end may be determined based on a preset receiving value agreed on in advance, to eliminate impact of inter-symbol interference on the value of the PTRS. Because the value of the PTRS actually received by the receive end is further affected by the phase noise, the phase noise may be calculated by using the actual receiving value and the preset receiving value of the PTRS.
  • the value of the first interference and the value of the second interference are determined based on a type of a receiver.
  • the first communication apparatus may determine, based on the type of the receiver, a calculation manner for calculating the inter-symbol interference.
  • the method further includes: The first communication apparatus obtains first indication information sent by the second communication apparatus, where the first indication information indicates the type of the receiver. In this manner, the second communication apparatus determines the type of the receiver and notifies the first communication apparatus of the type of the receiver.
  • the method further includes: The first communication apparatus sends second indication information to the second communication apparatus, where the second indication information indicates the type of the receiver. In this manner, the first communication apparatus determines the type of the receiver and notifies the second communication apparatus of the type of the receiver.
  • the method further includes: The first communication apparatus sends third indication information to the second communication apparatus, where the third indication information indicates the first parameter.
  • the method includes: The first communication apparatus sends fourth indication information to the second communication apparatus, where the fourth indication information indicates the second parameter.
  • this application provides a phase noise determining method.
  • the method includes: A second communication apparatus obtains a third signal, where the third signal is a signal obtained through introduction of phase noise into a second signal sent by a first communication apparatus, and the third signal includes a data signal and K phase-tracking reference signals PTRSs.
  • the second signal is a signal obtained through baseband signal processing performed on a first signal
  • the first signal includes a data signal and K PTRSs
  • a value of an m th PTRS in the K PTRSs in the first signal is determined based on a value of first interference, a value of second interference, and a preset receiving value of the m th PTRS
  • the first interference is inter-symbol interference generated by the data signal in the first signal on the m th PTRS
  • the second interference is inter-symbol interference generated by a PTRS other than the m th PTRS in the K PTRSs in the first signal on the m th PTRS
  • K and m are positive integers, and 1 ⁇ m ⁇ K.
  • the second communication apparatus determines the phase noise based on values of the K PTRSs in the third signal and preset receiving values of the K PTRSs in the first signal. In this manner, the third signal sent by a transmit end may be obtained, and the phase noise in the third signal may be calculated based on the actual receiving values of the K PTRSs in the third signal and the preset receiving values that are of the K PTRSs in the first signal and that are agreed on in advance.
  • the method further includes: The second communication apparatus converts the third signal into a first frequency domain signal.
  • the second communication apparatus performs channel equalization on the first frequency domain signal to obtain a second frequency domain signal.
  • the second communication apparatus preprocesses the second frequency domain signal based on a receiver, and converts the processed second frequency domain signal into a first time domain signal.
  • the second communication apparatus obtains the values of the K PTRSs in the third signal from the first time domain signal.
  • the method further includes: The second communication apparatus sends first indication information to the first communication apparatus, where the first indication information indicates a type of the receiver. In this manner, the second communication apparatus determines the type of the receiver and notifies the first communication apparatus of the type of the receiver.
  • the method further includes: The second communication apparatus obtains second indication information sent by the first communication apparatus, where the second indication information indicates a type of the receiver. In this manner, the first communication apparatus determines the type of the receiver and notifies the second communication apparatus of the type of the receiver.
  • the method further includes: The second communication apparatus converts the first frequency domain signal into a second time domain signal.
  • the second communication apparatus performs phase noise compensation on the second time domain signal based on the phase noise.
  • the method further includes: The second communication apparatus receives third indication information sent by the first communication apparatus, where the third indication information indicates a first parameter, and the first parameter is a value related to a signal amplitude. That the second communication apparatus determines the phase noise based on values of the K PTRSs in the third signal and preset receiving values of the K PTRSs in the first signal includes: The second communication apparatus determines the phase noise based on the values of the K PTRSs in the third signal, the preset receiving values of the K PTRSs in the first signal, and the first parameter.
  • the method further includes: The second communication apparatus receives fourth indication information sent by the first communication apparatus, where the fourth indication information indicates a second parameter, and the second parameter is a value related to a signal phase. That the second communication apparatus determines the phase noise based on values of the K PTRSs in the third signal and preset receiving values of the K PTRSs in the first signal includes: The second communication apparatus determines the phase noise based on the values of the K PTRSs in the third signal, the preset receiving values of the K PTRSs in the first signal, and the second parameter.
  • this application provides a communication apparatus.
  • the communication apparatus includes a transceiver unit and a processing unit.
  • the transceiver unit is configured to obtain a first signal, where the first signal includes a data signal and K phase-tracking reference signals PTRSs.
  • a value of an m th PTRS in the K PTRSs is determined based on a value of first interference, a value of second interference, and a preset receiving value of the m th PTRS, the first interference is inter-symbol interference generated by the data signal on the m th PTRS, the second interference is inter-symbol interference generated by a PTRS other than the m th PTRS in the K PTRSs on the m th PTRS, K and m are positive integers, and 1 ⁇ m ⁇ K.
  • the processing unit is configured to perform baseband signal processing on the first signal to obtain a second signal.
  • the transceiver unit is further configured to send the second signal to a second communication apparatus.
  • the value of the first interference and the value of the second interference are determined based on a type of a receiver.
  • the transceiver unit is further configured to obtain first indication information sent by the second communication apparatus, where the first indication information indicates the type of the receiver.
  • the transceiver unit is further configured to send second indication information to the second communication apparatus, where the second indication information indicates the type of the receiver.
  • the transceiver unit is further configured to send third indication information to the second communication apparatus, where the third indication information indicates the first parameter.
  • the transceiver unit is further configured to send fourth indication information to the second communication apparatus, where the fourth indication information indicates the second parameter.
  • this application provides another communication apparatus.
  • the communication apparatus includes a transceiver unit and a processing unit.
  • the transceiver unit is configured to obtain a third signal, where the third signal is a signal obtained through introduction of phase noise into a second signal sent by a first communication apparatus, and the third signal includes a data signal and K phase-tracking reference signals PTRSs.
  • the second signal is a signal obtained through baseband signal processing performed on a first signal
  • the first signal includes a data signal and K PTRSs
  • a value of an m th PTRS in the K PTRSs in the first signal is determined based on a value of first interference, a value of second interference, and a preset receiving value of the m th PTRS
  • the first interference is inter-symbol interference generated by the data signal in the first signal on the m th PTRS
  • the second interference is inter-symbol interference generated by a PTRS other than the m th PTRS in the K PTRSs in the first signal on the m th PTRS
  • K and m are positive integers, and 1 ⁇ m ⁇ K.
  • the processing unit is configured to determine the phase noise based on values of the K PTRSs in the third signal and preset receiving values of the K PTRSs in the first signal.
  • the processing unit is further configured to: convert the third signal into a first frequency domain signal; perform channel equalization on the first frequency domain signal to obtain a second frequency domain signal; preprocess the second frequency domain signal based on a receiver, and convert the processed second frequency domain signal into a first time domain signal; and obtain the values of the K PTRSs in the third signal from the first time domain signal.
  • the transceiver unit is further configured to send first indication information to the first communication apparatus, where the first indication information indicates a type of the receiver.
  • the transceiver unit is further configured to obtain second indication information sent by the first communication apparatus, where the second indication information indicates a type of the receiver.
  • the processing unit is further configured to: convert the first frequency domain signal into a second time domain signal; and perform phase noise compensation on the second time domain signal based on the phase noise.
  • the transceiver unit is further configured to obtain third indication information sent by the first communication apparatus, where the third indication information indicates a first parameter, and the first parameter is a value related to a signal amplitude.
  • the processing unit is specifically configured to determine the phase noise based on the values of the K PTRSs in the third signal, the preset receiving values of the K PTRSs in the first signal, and the first parameter.
  • the transceiver unit is further configured to obtain fourth indication information sent by the first communication apparatus, where the fourth indication information indicates a second parameter, and the second parameter is a value related to a signal phase.
  • the processing unit is specifically configured to determine the phase noise based on the values of the K PTRSs in the third signal, the preset receiving values of the K PTRSs in the first signal, and the second parameter.
  • this application provides another communication apparatus, including a processor, where the processor is coupled to a memory.
  • the memory is configured to store program code.
  • the processor is configured to invoke the program code from the memory to perform the method described in the first aspect or any possible implementation of the first aspect, or perform the method described in the second aspect or any possible implementation of the second aspect.
  • this application provides another communication apparatus.
  • the communication apparatus includes a logic circuit and an input/output interface.
  • the input/output interface is configured to input a first signal, and the input/output interface is further configured to output a second signal.
  • the logic circuit is configured to process the first signal and the second signal, and perform the method described in the first aspect or any possible implementation of the first aspect.
  • this application provides another communication apparatus.
  • the communication apparatus includes a logic circuit and an input/output interface.
  • the input/output interface is configured to input a third signal.
  • the logic circuit is configured to process the third signal, and perform the method described in the second aspect or any possible implementation of the second aspect.
  • this application provides a computer-readable storage medium.
  • the computer-readable storage medium is configured to store instructions. When the instructions are executed, the method described in the first aspect or any possible implementation of the first aspect is implemented, or the method described in the second aspect or any possible implementation of the second aspect is implemented.
  • this application provides a computer program product.
  • the computer program product includes a computer program or instructions.
  • the computer program or the instructions are run on a computer, the computer is enabled to perform the method described in the first aspect or any possible implementation of the first aspect, or perform the method described in the second aspect or any possible implementation of the second aspect.
  • the transmit end of the signal may preprocess the values of the K PTRSs in the first signal, so that under the assumed condition that there is no phase noise, the value of the PTRS received by the receive end of the signal may be determined based on the preset receiving value agreed on in advance, to eliminate the impact of the inter-symbol interference on the value of the PTRS. Because the values of the K PTRSs in the third signal actually received by the receive end are further affected by the phase noise, the receive end may calculate the phase noise by using the actual receiving values and the preset receiving values of the K PTRSs.
  • Embodiments of this application may be applied to a network architecture shown in FIG. 1 .
  • the network architecture shown in FIG. 1 is a network architecture of a wireless communication system.
  • the network architecture usually includes a terminal device and a network device.
  • a quantity and a form of each device constitute no limitation on embodiments of this application.
  • the terminal device and the network device may communicate with each other by using a single carrier.
  • the wireless communication system mentioned in embodiments of this application includes but is not limited to an Internet of Things (Internet of Things, IoT) system, a long term evolution (long term evolution, LTE) system, a 5th-generation (5th-generation, 5G) mobile communication system, a 6th-generation (6th-generation, 6G) mobile communication system, and a future mobile communication system.
  • IoT Internet of Things
  • LTE long term evolution
  • 5th-generation, 5G 5th-generation
  • 6th-generation 6th-generation
  • future mobile communication system a future mobile communication system.
  • the technical solutions in embodiments of this application may be further applied to a wireless local area network (Wireless Local Area Network, WLAN) network, may be further applied to a Vehicle-to-X (Vehicle-to-X, V2X) network, may be further applied to a non-terrestrial network (non-terrestrial network, NTN), a satellite and high-altitude platform (satellite and High-Altitude Platform, HAP), or enhanced Internet of Things (LTE enhanced MTO, eMTC), or may be applied to another network or the like.
  • the technical solutions in embodiments of this application may be further applied to a communication system with radar communication integration, a terahertz, and a higher frequency, and the like. This is not specifically limited in this application.
  • the network device in embodiments of this application may be a base station (Base Station, BS).
  • the base station may provide communication services for a plurality of terminal devices, or a plurality of base stations may provide communication services for a same terminal device.
  • the base station in embodiments of this application is an apparatus that is deployed in a radio access network and that is configured to provide a wireless communication function for the terminal device.
  • the base station device may be a base station, a relay station, or an access point.
  • the base station may be an eNB or an eNodeB (Evolutional NodeB) in long term evolution (Long Term Evolution, LTE).
  • the base station device may be a radio controller in a cloud radio access network (Cloud Radio Access Network, CRAN) scenario.
  • CRAN Cloud Radio Access Network
  • the base station device may be a base station device in a future 5G network or a network device in a future evolved PLMN network.
  • the base station device may be a wearable device, a vehicle-mounted device, or the like.
  • an apparatus configured to implement a function of the network device may be a network device, or may be an apparatus that can support the network device in implementing the function, for example, a chip system. The apparatus may be installed in the network device.
  • the terminal device in embodiments of this application may also be referred to as a terminal, and may be a device with a wireless transceiver function.
  • the terminal device in embodiments of this application may include various user equipment (user equipment, UE), access terminals, UE units, UE stations, mobile stations, remote stations, remote terminals, mobile devices, LTE terminals, terminals, wireless communication devices, LTE agents, LTE apparatuses, or the like that have a wireless communication function.
  • the access terminal may be a cellular phone, a cordless phone, a session initiation protocol (Session Initiation Protocol, SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital assistant (Personal Digital Assistant, PDA), a handheld device with a wireless communication function, a computing device, another processing device connected to a wireless modem, an unmanned aerial vehicle (or referred to as a drone for short) (unmanned aerial vehicle/drone, UAV), a vehicle-mounted device, a wearable device, a terminal device in a future 5G network, a terminal device in a future evolved PLMN network, or the like.
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • an apparatus configured to implement a function of the terminal may be a terminal, or may be an apparatus that can support the terminal in implementing the function, for example, a chip system.
  • the apparatus may be installed in the terminal.
  • the chip system may include a chip, or may include a chip and another discrete component.
  • Embodiments of this application may be applied to a device to device (device to device, D2D) system, a machine to machine (machine to machine, M2M) system, a vehicle to everything (vehicle to everything, V2X) system in which a vehicle communicates with anything, or the like.
  • D2D device to device
  • M2M machine to machine
  • V2X vehicle to everything
  • Embodiments of this application may be applied to a next-generation microwave scenario, an NR-based microwave scenario, a backhaul (integrated access backhaul, IAB) scenario, or the like.
  • a next-generation microwave scenario an NR-based microwave scenario
  • a backhaul (integrated access backhaul, IAB) scenario or the like.
  • Embodiments of this application may be applied to an uplink transmission scenario, that is, a scenario in which a terminal device sends an uplink signal to a network device; or may be applied to a downlink transmission scenario, that is, a scenario in which a network device sends a downlink signal to a terminal device.
  • the network architecture and a service scenario described in embodiments of this application are intended to describe the technical solutions in embodiments of this application more clearly, and do not constitute any limitation on the technical solutions provided in embodiments of this application.
  • a person of ordinary skill in the art may know that with evolution of the network architecture and emergence of a new service scenario, the technical solutions provided in embodiments of this application are also applicable to similar technical problems.
  • Peak-to-average power ratio Peak-to-average power ratio, PAPR
  • a radio signal In time domain, a radio signal is a sine wave with a changing amplitude. The amplitude is not constant. A peak signal amplitude in one period is different from that in another period. Therefore, average power and peak power in each period are different. In a long period, the peak power is maximum transient power that occurs with a specific probability. The probability is usually 0.01% (that is, 10 ⁇ -4). Under this probability, a ratio of the peak power to total average power of a system is the PAPR.
  • Power amplification needs to be performed on a signal of a wireless communication system before the signal is sent to a remote place. Due to limitation of a technology and equipment costs, one power amplifier usually linearly amplifies in only one range. If the range is exceeded, signal distortion is caused. The signal distortion causes a receive end of the received signal to be unable to correctly parse the signal. To ensure that a peak value of the signal is still within a linear range that the power amplifier can normally amplify power, average power of the transmitted signal needs to be reduced. In this manner, efficiency of the power amplifier is low, or equivalently, a coverage area becomes smaller.
  • a signal of orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) on one carrier is represented as a sine (sinc) function
  • there is tailing on left and right sides In a specific probability, tailing of a plurality of carriers may be superimposed at a distance to form a point with large peak power.
  • using an OFDM waveform easily causes a problem of an excessively high PAPR.
  • the single carrier has a lower PAPR than the OFDM waveform, and the present invention considers a scenario in which data is transmitted by using a single carrier-based waveform.
  • the single carrier includes but is not limited to the following waveforms: a single carrier-quadrature amplitude modulation (single carrier-quadrature amplitude modulation, SC-QAM) waveform, a single carrier-offset quadrature amplitude modulation (Single carrier-Offset quadrature amplitude modulation, SC-OQAM) waveform, a DFT-s-OFDM waveform, a single carrier transform spread-based orthogonal frequency division multiplexing (discrete Fourier transform spread orthogonal frequency division multiplexing, DFT-s-OFDM with FTSS) waveform that carries a DFT-s-OFDM signal with a real and imaginary part separation, a DFT-s-OFDM signal of a pulse amplitude modulation (pulse amplitude modulation, PAM) constellation,
  • the DFT-s-OFDM is a single-carrier waveform technology based on an OFDM implementation architecture. Compared with the OFDM waveform, the DFT-s-OFDM waveform provides higher output power and higher power amplification efficiency at same power amplification, so that coverage can be improved and energy consumption can be reduced.
  • the DFT-s-OFDM waveform may be used in uplink transmission.
  • long term evolution long term evolution
  • 5G 5th-generation
  • NR new radio
  • a frequency band of the high frequency communication may be 24250 MHz to 52600 MHz in the NR system, may be a frequency band above 52600 MHz supported by a subsequently evolved NR system, or may be a higher frequency band of a next generation communication system, for example, a terahertz (THz) frequency band.
  • THz terahertz
  • DFT discrete Fourier transform
  • FIG. 2 is a schematic diagram of a processing procedure of a DFT-s-OFDM technology according to an embodiment of this application.
  • a transmit end sequentially performs processing, for example, serial-to-parallel (serial-to-parallel) conversion, N-point discrete Fourier transform (discrete Fourier transform, DFT), subcarrier mapping, M-point inverse discrete Fourier transform (inverse discrete Fourier transform, IDFT), parallel-to-serial (parallel-to-serial) conversion, cyclic prefix (cyclic prefix, CP) addition, and digital-to-analog conversion (digital-to-analog conversion, DAC) on a time domain discrete sequence, and then sends a signal through an antenna port and a channel (channel).
  • serial-to-parallel serial-to-parallel
  • DFT discrete Fourier transform
  • IDFT inverse discrete Fourier transform
  • IDFT inverse discrete Fourier transform
  • parallel-to-serial parallel
  • a receive end When receiving a signal through the channel and the antenna port, a receive end sequentially performs analog-to-digital conversion (analog-to-digital conversion, ADC), cyclic prefix removal, serial-to-parallel (serial-to-parallel) conversion, M-point DFT, subcarrier mapping removal, N-point IDFT, and parallel-to-serial (parallel-to-serial) conversion on the signal, to obtain a time domain discrete sequence.
  • analog-to-digital conversion analog-to-digital conversion
  • ADC analog-to-digital conversion
  • cyclic prefix removal serial-to-parallel (serial-to-parallel) conversion
  • M-point DFT serial-to-parallel
  • subcarrier mapping removal subcarrier mapping removal
  • N-point IDFT subcarrier mapping removal
  • parallel-to-serial parallel-to-serial
  • the transmit end may obtain a frequency domain sequence of the time domain discrete sequence through the N-point DFT.
  • the IDFT is input to perform the M-point IDFT, where N ⁇ M. Because a length of the IDFT is greater than a length of the DFT, a part that is in the IDFT and in which the length of the IDFT exceeds the length of the DFT is input with zero for padding. After the IDFT, the cyclic prefix is added to avoid symbol interference.
  • the DFT-s-OFDM Compared with OFDM, the DFT-s-OFDM has a lower PAPR. This can improve power transmission efficiency of a mobile terminal, prolong battery life, and reduce terminal costs.
  • Orthogonal frequency division multiplexing with frequency domain spectrum shaping (discrete Fourier transform spread orthogonal frequency division multiplexing with frequency domain spectrum shaping, DFT-s-OFDM with FDSS)
  • a DFT-s-OFDM with FDSS waveform is a special DFT-s-OFDM waveform. Compared with the DFT-s-OFDM, the DFT-s-OFDM with FDSS technology adds a frequency domain spectrum shaping operation.
  • FIG. 3 is a schematic diagram of a processing procedure of a DFT-s-OFDM with FDSS technology according to an embodiment of this application.
  • a transmit end sequentially performs operations such as discrete Fourier transform (discrete Fourier transform, DFT), frequency domain spectrum shaping (frequency domain spectrum shaping, FDSS), subcarrier mapping (subcarrier mapping), inverse fast Fourier transform (inverse fast Fourier transform, IFFT), and cyclic prefix (cyclic prefix, CP) addition on a modulated (modulation) signal.
  • DFT discrete Fourier transform
  • FDSS frequency domain spectrum shaping
  • subcarrier mapping subcarrier mapping
  • IFFT inverse fast Fourier transform
  • cyclic prefix cyclic prefix, CP
  • the filter is a filter circuit including a capacitor, an inductor, and a resistor.
  • the filter may effectively filter out a frequency of a specific frequency or a frequency other than the frequency in a power cable, to obtain a signal of a specific frequency or a signal obtained through elimination of a specific frequency. Based on a frequency selection function of the filter, interference noise in the signal can be filtered out or spectrum analysis can be performed.
  • the Filter may be mainly classified into a Nyquist (Nyquist) filter and a non-Nyquist filter based on whether there is inter-symbol interference (inter-symbol interference, ISI).
  • Nyquist Nyquist
  • ISI inter-symbol interference
  • the Nyquist filter is defined as follows: if a waveform of a previous code element is attenuated to 0 at a determining moment of a next code element, transmission can be performed without elimination of the inter-symbol interference. This filter is referred to as the Nyquist filter. Correspondingly, a filter that has no foregoing characteristic may be collectively referred to as the non-Nyquist filter.
  • FIG. 4 is a schematic diagram of a processed signal in a Nyquist filter according to an embodiment of this application.
  • a signal A is a signal preceding a signal B, and at a determining moment (Ts) of the signal B, the signal A has been attenuated to 0.
  • Ts determining moment
  • FIG. 5 is a schematic diagram of a processed signal in a non-Nyquist filter according to an embodiment of this application.
  • a signal C is a signal preceding a signal D, and at a determining moment (Td) of the signal D, a value of the signal C is not 0.
  • Td determining moment
  • the signal C affects the signal D, and there is inter-symbol interference between the signal C and the signal D.
  • the Nyquist filter is not a choice of optimal performance.
  • a filter that meets a sideband envelope variance minimization criterion and that has an optimal PAPR may be designed.
  • the filter designed in this way is a non-Nyquist filter.
  • the non-Nyquist filter can reduce a PAPR of a signal.
  • the non-Nyquist filter may be designed to have better frequency domain flatness than the Nyquist filter, to have better channel estimation performance.
  • the non-Nyquist filter may be designed to have higher-energy tailing than the Nyquist filter, to have better performance at a tailing signal. It can be seen that the non-Nyquist filter is an excellent highfrequency signal filter.
  • Phase noise phase noise
  • phase noise is a random change of a phase of an output signal of a communication device when the communication device (for example, various radio frequency components) that sends a signal are affected by various noise.
  • a frequency band resource of a high frequency (a frequency band higher than 6 GHz, mainly including 28 GHz, 39 GHz, 60 GHz, 73 GHz, and the like) is increasingly used to transmit a signal.
  • the high frequency may provide an antenna array with high bandwidth and high integration for communication to achieve high throughput.
  • a phase noise problem of the high frequency band is excessively prominent. As the frequency band increases, a higher phase noise power spectral density indicates a greater impact on a received signal.
  • phase-tracking reference signal phase-tracking reference signal
  • phase noise is a random phase value generated at each sampling point n.
  • a basic principle of phase noise estimation by using the PTRS is that a known PTRS (that is, known x(n)) is placed at a transmit end, a received PTRS (that is, known y ( n )) is read at a receive end, and a phase noise value (that is, a value ⁇ ) may be calculated based on x ( n ) and y ( n ) .
  • the non-Nyquist filter introduces inter-symbol interference of adjacent code elements in the signal
  • the phase noise calculated by using the foregoing Formula 1-1 actually further includes the impact of the inter-symbol interference, and the phase noise cannot be effectively determined. This causes the poor de-modulation performance of the signal and reduces the communication quality.
  • the solutions in embodiments of this application are provided.
  • the signal receive end processes the signal by using the non-Nyquist filter.
  • FIG. 6 is a flowchart of a phase noise determining method according to an embodiment of this application.
  • the method may be implemented based on the network architecture shown in FIG. 1 .
  • a first communication apparatus may be the network device in FIG. 1
  • a second communication apparatus may be the terminal device in FIG. 1 .
  • the first communication apparatus may be the terminal device in FIG. 1
  • the second communication apparatus may be the network device in FIG. 1 .
  • the method includes the following steps.
  • the first communication apparatus obtains a first signal.
  • the first communication apparatus may generate the first signal by the first communication apparatus, and the first communication apparatus may alternatively receive the first signal from another communication apparatus. In a possible implementation, the first communication apparatus may alternatively generate a part of the first signal, and receive a part of the first signal from another communication apparatus. For example, the first communication apparatus may receive a data signal sent by the another communication apparatus to the first communication apparatus, and the first communication apparatus generates M phase-tracking reference signals (PTRSs) based on the data signal.
  • PTRSs phase-tracking reference signals
  • the first signal may be a DFT-s-OFDM signal.
  • the first signal includes one or more DFT-s-OFDM signals, one DFT-s-OFDM signal includes at least one block-phase-tracking reference signal (Block-PTRS) pattern, and one DFT-s-OFDM signal includes a data signal and K PTRSs.
  • Block-PTRS block-phase-tracking reference signal
  • the DFT-s-OFDM signal may be at least one of the following signals: an orthogonal frequency division multiplexing with frequency domain spectrum shaping DFT-s-OFDM with FDSS signal, a single carrier-quadrature amplitude modulation (single carrier-quadrature amplitude modulation, SC-QAM) signal based on a non-Nyquist filter, a DFT-s-OFDM signal based on a non-Nyquist filter, a DFT-s-OFDM with frequency domain spectrum shaping (DFT-s-OFDM with FDSS) signal based on a non-Nyquist filter, a uw-DFT-s-OFDM signal based on an addition filter of a non-Nyquist filter, a zero tail discrete Fourier transform spread orthogonal frequency division multiplexing (zero tail discrete Fourier transform spread OFDM, zt-DFT-s-OFDM) signal based on a non-Nyquis
  • FIG. 7 is a schematic diagram of Block-PTRSs of some DFT-s-OFDM signals according to an embodiment of this application.
  • each grid represents one sampling point (or referred to as a quadrature amplitude modulation (quadrature amplitude modulation, QAM) symbol, a pi/2 binary phase shift keying (binary phase shift keying, BPSK) symbol, or a quadrature phase shift keying (quadrature phase shift keying, QPSK) symbol).
  • QAM quadrature amplitude modulation
  • BPSK binary phase shift keying
  • QPSK quadrature phase shift keying
  • a parameter (that is, 2*2, 2*4, 4*2, 4*4, 8*4) of a Block-PTRS pattern indicates a quantity P of PTRS groups in one DFT-s-OFDM signal and a quantity Q of sampling points in the group, that is, a total quantity of PTRSs is P*Q. It should be noted that a specific mapping location of the PTRS is related to the two parameters and scheduled bandwidth.
  • the scheduled bandwidth is evenly divided into P segments or P intervals, and one PTRS group is mapped to a middle of each segment, as shown in a first row and a third row in FIG. 4 .
  • the scheduled bandwidth is evenly divided into P segments or P intervals, and then one PTRS group is mapped to each segment or interval, where a PTRS group of a first segment is mapped to a header of the first segment, a PTRS group of a P th segment is mapped to a tail of the P th segment, and a PTRS group of another segment (or referred to as an interval) is mapped to the middle, as shown in a second row (because there are only two segments in this case, there is no PTRS group mapped to the middle of the segment), a fourth row, and a fifth row in FIG. 4 .
  • the foregoing two parameters are implicitly determined based on current scheduled bandwidth N RB and a preconfigured mapping relationship (a correspondence between the scheduled bandwidth and the parameter, as shown in Table 1, where N RB0 to N RB4 are preconfigured values).
  • the first signal in this embodiment of this application may be the DFT-s-OFDM signal generated based on the foregoing location mapping manner of the PTRS and the data signal.
  • the location mapping of the PTRS and the data signal in the first signal may be alternatively performed in another manner. This is not limited in this embodiment of this application.
  • the foregoing content describes the location mapping manner of the PTRS in the first signal.
  • the following specifically describes a manner of determining a value of the PTRS in the first signal in this embodiment of this application.
  • the first signal includes a data signal and K phase-tracking reference signals PTRSs.
  • a value of an m th PTRS in the K PTRSs is determined based on a value of first interference, a value of second interference, and a preset receiving value of the m th PTRS, the first interference is inter-symbol interference generated by the data signal on the m th PTRS, the second interference is inter-symbol interference generated by a PTRS other than the m th PTRS in the K PTRSs on the m th PTRS, K and m are positive integers, and 1 ⁇ m ⁇ K.
  • the value of the PTRS includes an amplitude and a phase of the PTRS. It should be noted that the m th PTRS may be any one of the K PTRSs.
  • a preset receiving value of the PTRS is agreed on by the first communication apparatus and the second communication apparatus in advance. In other words, both the first communication apparatus and the second communication apparatus know the preset receiving value of the PTRS.
  • the first communication apparatus preprocesses the values of the K PTRSs, so that under an assumed condition that there is no phase noise, a value of a PTRS received by a receive end (that is, the second communication apparatus) may be determined based on the preset receiving value agreed on in advance, to eliminate impact of inter-symbol interference on the value of the PTRS. It should be noted that the value of the PTRS actually received by the receive end is not equal to the preset receiving value because there is further impact of phase noise. An objective of this solution is to eliminate impact of the inter-symbol interference on the value of the PTRS. In this way, the phase noise may be calculated based on the actual receiving value and the preset receiving value of the PTRS.
  • a sum of the value of the m th PTRS, the value of the first interference, and the value of the second interference is equal to the preset receiving value of the m th PTRS.
  • the first signal includes N data signals.
  • S ⁇ PTRS ( m ) is the value of the m th PTRS in the first signal
  • ⁇ n 1 N ISI Data
  • n m is the inter-symbol interference, that is, the first interference, generated by the N data signals on the m th PTRS.
  • S(m) is the preset receiving value of the m th PTRS.
  • m is an index value (or referred to as a sequence number, a number, a label, or the like) of the PTRS. It should be noted that the index value of the PTRS may alternatively be designed starting from 0. In this case, a value of the 1 st PTRS is represented as S ⁇ PTRS (0). In addition, there may be another index value design manner. The design manner of the index value is not limited in this embodiment of this application.
  • values of the N data signals and preset receiving values of the K PTRSs are known. There are K PTRS signals in the first signal. Therefore, there are a total of K unknown numbers S ⁇ PTRS ( m )s and K equations in Formula 1-2. The K equations may be solved to obtain S ⁇ PTRS ( m ), that is, the value of each PTRS.
  • a preset interference value or an interference calculation formula may be further added to a left part of Formula 1-2, to compensate for other interference received by a signal in a transmission process.
  • the value of the first interference and the value of the second interference may be determined based on a type of a receiver.
  • the type of the receiver may include a matched filtering receiver, a rectangular window receiver, an RC receiver, and the like.
  • the first communication apparatus may determine, based on the type of the receiver, a calculation manner (for example, may be a calculation formula) for calculating the inter-symbol interference (or referred to as inter-symbol interference) (inter-symbol interference, ISI).
  • ISI inter-symbol interference
  • Expressions of the specific value of the first interference and the value of the second interference may be obtained based on the calculation manner, the values of the N data signals, and the K S ⁇ PTRS ( m )s.
  • the expressions of the value of the first interference and the value of the second interference are substituted into Formula 1-2 for calculation, and values of the K S PTRS ( m ) s may be obtained through calculation.
  • the type of the receiver may be determined by the second communication apparatus.
  • the type of the receiver may be a type of a receiver that is disposed on the second communication apparatus and that is configured to receive a signal. It should be noted that the type of the receiver may be another type.
  • the method further includes: The first communication apparatus obtains first indication information sent by the second communication apparatus, where the first indication information indicates the type of the receiver.
  • a manner in which the first communication apparatus obtains the first indication information may be that the first communication apparatus receives the first indication information sent by the second communication apparatus, or the first communication apparatus sends a request for requesting the first indication information to the second communication apparatus, and then receives the first indication information sent by the second communication apparatus in response to the request. In this manner, the first communication apparatus may process the first signal based on the type of the receiver indicated by the first indication information.
  • the type of the receiver may alternatively be determined by the first communication apparatus.
  • the type of the receiver may be a type of a receiver that is disposed on the first communication apparatus and that is configured to receive a signal. It should be noted that the type of the receiver may be another type.
  • the method further includes: The first communication apparatus sends second indication information to the second communication apparatus, where the second indication information indicates the type of the receiver.
  • the second communication apparatus obtains the second indication information sent by the first communication apparatus.
  • the first communication apparatus may first receive a request that is sent by the second communication apparatus and that is for requesting the second indication information, and in response to the request, the first communication apparatus sends the second indication information to the second communication apparatus.
  • the first communication apparatus may send the second indication information to the second communication apparatus before sending a second signal, may send the second indication information to the second communication apparatus after sending the second signal, or may send the second indication information to the second communication apparatus when sending the second signal.
  • An occasion at which the first communication apparatus sends the second indication information is not limited in this embodiment of this application. In this manner, the first communication apparatus may notify the second communication apparatus of the type of the receiver based on which the first signal is generated.
  • the first communication apparatus sends the second signal to the second communication apparatus, where the second signal is a signal obtained through baseband signal processing performed on the first signal.
  • the first signal may be sent to the second communication apparatus through an antenna.
  • FIG. 8 is a schematic flowchart of generating a second signal by a first communication apparatus according to an embodiment of this application.
  • the first communication apparatus performs PTRS preprocessing on a pre-received PTRS (which may be understood as a PTRS whose value is a preset receiving value) and a data signal, to obtain K PTRSs in a first signal.
  • the first communication apparatus performs signal mapping on the K PTRSs and the data signal, to generate the first signal.
  • the first communication apparatus performs baseband signal processing on the first signal, to obtain the second signal.
  • Step a1 Perform discrete Fourier transform (DFT) on the first signal to obtain a frequency domain signal f1 corresponding to the first signal.
  • DFT discrete Fourier transform
  • Step b1 Perform frequency domain spectrum shaping (FDSS) on the frequency domain signal f1 to obtain a frequency domain signal f2.
  • FDSS frequency domain spectrum shaping
  • Step c1 Perform subcarrier mapping on the frequency domain signal f2, and perform inverse fast Fourier transform (IFFT) on the mapped signal to obtain a time domain signal f3.
  • IFFT inverse fast Fourier transform
  • Step d1 Add a cyclic prefix (add CP) to the time domain signal f3 to obtain the second signal.
  • the second communication apparatus obtains a third signal, where the third signal is a signal obtained through introduction of phase noise into the second signal sent by the first communication apparatus.
  • the third signal also includes a data signal and K PTRSs. Due to impact of the phase noise, values of the data signal and the K PTRSs in the third signal are different from values of a data signal and K PTRSs in the second signal.
  • the second communication apparatus determines the phase noise based on the values of the K PTRSs in the third signal and the preset receiving values of the K PTRSs in the first signal.
  • a principle that the second communication apparatus may determine the phase noise based on the values of the K PTRSs in the third signal and the preset receiving values of the K PTRSs in the first signal is first described.
  • x ( m ) e j ⁇ m is the PTRS that is actually received by the second communication apparatus and that is affected by the phase noise ( e j ⁇ m ) .
  • x ( m ) is a PTRS that should be received by the second communication apparatus in a condition without the phase noise.
  • S(m) is a preset receiving value of the m th PTRS.
  • the following describes a method in which the second communication apparatus determines the phase noise based on the values of the K PTRSs in the third signal and the preset receiving values of the K PTRSs in the first signal.
  • the second communication apparatus before the second communication apparatus determines the phase noise based on the values of the M PTRSs in the third signal and the preset receiving values of the M PTRSs in the first signal, the second communication apparatus needs to process the third signal to obtain the values of the M PTRSs in the third signal.
  • FIG. 9 is a schematic flowchart of processing a third signal by a second communication apparatus according to an embodiment of this application.
  • FIG. 9 includes a procedure in which the second communication apparatus obtains values of M PTRSs in the third signal.
  • the procedure may include the following steps.
  • Step a2 The second communication apparatus converts the third signal into a first frequency domain signal.
  • the second communication apparatus performs cyclic prefix removal (-CP) processing on the third signal, then performs fast Fourier transform (FFT), and then performs subcarrier de-mapping (subcarrier de-mapping) to obtain the first frequency domain signal.
  • -CP cyclic prefix removal
  • FFT fast Fourier transform
  • subcarrier de-mapping subcarrier de-mapping
  • Step b2 The second communication apparatus performs channel equalization (channel equalization) on the first frequency domain signal to obtain a second frequency domain signal.
  • channel equalization processing is performed to eliminate impact of a channel for transmitting the third signal on the third signal.
  • Step c2 The second communication apparatus preprocesses the second frequency domain signal based on a receiver, and converts the processed second frequency domain signal into a first time domain signal.
  • the receiver is a preset or predefined receiver.
  • a type of the receiver is the type of the receiver indicated in the first indication information or the second indication information described in the foregoing content.
  • inter-symbol interference to a value of an actually received PTRS is the same as inter-symbol interference calculated in a design process of a first signal.
  • x(m) is equal to the preset receiving value S(m).
  • the second communication apparatus After preprocessing the second frequency domain signal based on the receiver, the second communication apparatus performs inverse discrete Fourier transform (IDFT) on the preprocessed signal, to convert the processed second frequency domain signal into the first time domain signal.
  • IDFT inverse discrete Fourier transform
  • Step d2 The second communication apparatus obtains the values of the M PTRSs in the third signal from the first time domain signal.
  • the second communication apparatus samples the first time domain signal, and obtains the values of the M PTRSs in the third signal from the first time domain signal.
  • the second communication apparatus may determine a location mapping relationship between the PTRS and a data signal in the third signal based on a value of scheduled bandwidth N RB (refer to a mapping relationship in Table 1), sample the first time domain signal based on a determined mapping location of the PTRS, and obtain the values of the M PTRSs in the third signal from the first time domain signal. It should be noted that this manner is merely an example. For different design manners of location mapping of the PTRS and the data signal, the values of the M PTRSs in the third signal obtained by the second communication apparatus may change correspondingly. This is not limited in this embodiment of this application.
  • the second communication apparatus may determine the phase noise based on the values of the K PTRSs in the third signal and the preset receiving values of the K PTRSs in the first signal in the manner described in Formula 1-3.
  • the method may further include (refer to the procedure shown in FIG. 9 ):
  • the second communication apparatus converts the first frequency domain signal into a second time domain signal.
  • the second communication apparatus performs phase noise compensation on the second time domain signal based on the phase noise.
  • a time domain signal on which phase noise compensation is performed may be further processed to obtain a final data signal.
  • a processing manner may be: performing discrete Fourier transform (DFT) on the time domain signal on which the phase noise compensation is performed, to convert the time domain signal into a frequency domain signal, and then processing the frequency domain signal based on an inter-symbol interference-free receiver to obtain a frequency domain signal without inter-symbol interference.
  • DFT discrete Fourier transform
  • inverse discrete Fourier transform (IDFT) is performed on the processed frequency domain signal to convert the processed frequency domain signal into a time domain signal, and then de-modulation (de-modulation) is performed on the signal to obtain the data signal, or a subsequent operation may be performed based on the data signal.
  • IDFT inverse discrete Fourier transform
  • the values of the K S ⁇ PTRS ( m ) s calculated by using Formula 1-2 may be inappropriate.
  • the calculated value may be excessively large, so that peak-to-average power introduced by the PTRS is large, and signal quality is affected.
  • the calculated value may be excessively small, so that the PTRS is easily affected by other interference (for example, white noise). This is unfavorable to subsequent phase noise calculation based on the actual receiving value of the PTRS, and affects determining of the phase noise.
  • the first communication apparatus preprocesses the values of the K PTRSs, so that under the assumed condition that there is no phase noise, the value of the PTRS received by the receive end (that is, the second communication apparatus) may be determined based on the preset receiving value agreed on in advance and the first parameter, to eliminate the impact of the inter-symbol interference on the value of the PTRS.
  • a sum of the value of the m th PTRS, the value of the first interference, and the value of the second interference is equal to a product of the preset receiving value of the m th PTRS and the first parameter.
  • the first signal includes N data signals.
  • S ⁇ PTRS ( m ) is the value of the m th PTRS in the first signal
  • ⁇ n 1 N ISI Data
  • n m is the inter-symbol interference, that is, the first interference, generated by the N data signals on the m th PTRS.
  • S(m) is the preset receiving value of the m th PTRS.
  • A is the first parameter, the first parameter is the value related to the amplitude, and A may be a real number, m is an index value (or referred to as a sequence number, a number, a label, or the like) of the PTRS. It should be noted that the index value of the PTRS may alternatively be designed starting from 0. In this case, a value of the 1 st PTRS is represented as S ⁇ PTRS (0). In addition, there may be another index value design manner. The design manner of the index value is not limited in this embodiment of this application.
  • values of the N data signals and preset receiving values of the K PTRSs are known. There are K PTRS signals in the first signal. Therefore, there are a total of K unknown numbers S ⁇ PTRS ( m )s and K equations in Formula 1-4. The K equations may be solved to obtain S ⁇ PTRS ( m ), that is, the value of each PTRS.
  • a preset interference value or an interference calculation formula may be further added to a left part of Formula 1-4, to compensate for other interference received by a signal in a transmission process.
  • FIG. 10 is a schematic diagram of an amplitude-adjustable PTRS according to an embodiment of this application.
  • a PTRS obtained through elimination of impact of inter-symbol interference for example, an ISI signal
  • a preset receiving value for example, a PTRS-1
  • the PTRS-2 requires large energy (as shown by the PTRS-2 in the figure).
  • a high-energy signal causes a PAPR increase, the PTRS-2 affects a PAPR of a system.
  • the PTRS sent by the transmit end may be designed as a PTRS-3, so that a phase of a signal (for example, a PTRS-4) obtained through addition of the PTRS-4 and the ISI signal is consistent with a phase of the preset receiving value of the PTRS, but an amplitude is less than the phase of the preset receiving value.
  • a PAPR problem caused by the high-energy signal can be alleviated.
  • an amplitude of the PTRS-2 that needs to be sent by the transmit end may be excessively small.
  • the PTRS sent by the transmit end may be designed as a PTRS-3, so that a phase of a signal obtained through addition of the PTRS-3 and the ISI signal is consistent with a phase of the preset receiving value of the PTRS, but an amplitude is greater than the phase of the preset receiving value.
  • anti-interference for example, white noise
  • a value of A (that is, the first parameter) may be one of the following values: 1, 1.5, 0.5, 2 , 10 , 42 , 170 , 648 , or the like.
  • the value of A may be one of the following values: 1, 1.5, 0.5, sqrt(2), sqrt(10), sqrt(42), sqrt(170), sqrt(648), or the like. It should be noted that, in an actual application, the value of A may be an approximate value of these values listed above, for example, 2 may be 1.414 (or 1.41 and 1.4).
  • an energy value of an existing constellation point is referred to for the value of the first parameter.
  • signaling overheads for notifying the receive end of the first parameter can be reduced. Because the energy of the constellation point is defined in a protocol, the energy can be easily obtained.
  • the value of the first parameter may be associated with a constellation point of a sent signal. In this way, the receive end may obtain the determined value of the first parameter based on the received signal. In addition, if the value of the first parameter comes from the constellation point (data signal selection), it can be ensured that energy of the first signal is not excessively high.
  • the following describes a determining manner of determining the value of the first parameter.
  • the first communication apparatus may preset a value range of the K S ⁇ PTRS ( m ).
  • a value in the value range is not excessively large to cause a PAPR of the first signal to be large, and is also not excessively small to affect subsequent phase noise calculation.
  • a maximum value in the value range may not be greater than energy of an outermost constellation point, or not greater than unit signal energy (for example, 1), or the maximum value makes time domain signal energy generated at the PTRS not greater than maximum peak signal energy, or the like.
  • a minimum value in the value range may be not less than 3 dB times a signal-to-noise ratio of PTRS signal de-modulation.
  • the first communication apparatus may select one value from a plurality of possible values of the first parameter based on a requirement of the value range.
  • the value of the first parameter can enable the values of the K S ⁇ PTRS ( m ) s to fall within the value range.
  • the method further includes: The first communication apparatus sends third indication information to the second communication apparatus, where the third indication information indicates the first parameter.
  • the second communication apparatus obtains the third indication information sent by the first communication apparatus.
  • the third indication message may include an index corresponding to the first parameter.
  • Table 2 shows a possible correspondence between the value of the first parameter and the index according to an embodiment of this application.
  • Table 2 Index Value of the first parameter 1 1 2 1.5 3 0.5 4 sqrt(2) 5 sqrt(10) 6 sqrt(42) 7 sqrt(170) 8 sqrt(648) ... ...
  • the second communication apparatus determines the phase noise based on the values of the K PTRSs in the third signal and the preset receiving values of the K PTRSs in the first signal includes: The second communication apparatus determines the phase noise based on the values of the K PTRSs in the third signal, the preset receiving values of the K PTRSs in the first signal, and the first parameter.
  • x ( m ) e j ⁇ m is the PTRS that is actually received by the second communication apparatus and that is affected by the phase noise ( e j ⁇ m ). It may be learned from the above analysis that x(m) should be equal to AS ( m ) . In other words, in Formula 1-5, x ( m ) e j ⁇ m and AS ( m ) are known, so that the phase noise ( e j ⁇ m ) may be solved.
  • the second parameter indicates a relationship between a phase of the actual receiving value of the m th PTRS and that of the preset receiving value of the m th PTRS under the assumed condition that there is no phase noise. In this manner, the requirement on the values of the K PTRSs is relaxed by using the second parameter.
  • the first communication apparatus preprocesses the values of the K PTRSs, so that under the assumed condition that there is no phase noise, the value of the PTRS received by the receive end (that is, the second communication apparatus) may be determined based on the preset receiving value agreed on in advance and the second parameter, to eliminate the impact of the inter-symbol interference on the value of the PTRS.
  • a sum of the value of the m th PTRS, the value of the first interference, and the value of the second interference is equal to a product of the preset receiving value of the m th PTRS and a phase offset indicated by the second parameter.
  • the first signal includes N data signals.
  • n m is the inter-symbol interference, that is, the first interference, generated by the N data signals on the m th PTRS.
  • S(m) is the preset receiving value of the m th PTRS.
  • e j ⁇ m is the phase offset indicated by the second parameter.
  • the second parameter is ⁇ m
  • the second parameter is the value related to the phase
  • the second parameter may be an angle value.
  • m is an index value (or referred to as a sequence number, a number, a label, or the like) of the PTRS. It should be noted that the index value of the PTRS may alternatively be designed starting from 0. In this case, a value of the 1 st PTRS is represented as S ⁇ PTRS (0) . In addition, there may be another index value design manner. The design manner of the index value is not limited in this embodiment of this application.
  • values of the N data signals and preset receiving values of the K PTRSs are known. There are K PTRS signals in the first signal. Therefore, there are a total of K unknown numbers S ⁇ PTRS ( m )s and K equations in Formula 1-6. The K equations may be solved to obtain S ⁇ PTRS ( m ), that is, the value of each PTRS.
  • a preset interference value or an interference calculation formula may be further added to a left part of Formula 1-6, to compensate for other interference received by a signal in a transmission process.
  • FIG. 11 is a schematic diagram of a phase-adjustable PTRS according to an embodiment of this application.
  • a PTRS obtained through elimination of impact of inter-symbol interference for example, an ISI signal
  • a preset receiving value for example, a PTRS-5
  • the PTRS-6 requires large energy (as shown by the PTRS-6 in the figure).
  • a high-energy signal causes a PAPR increase
  • the PTRS-6 affects a PAPR of a system.
  • the PTRS sent by the transmit end may be designed as a PTRS-7, so that an amplitude of a signal (for example, a PTRS-8) obtained through addition of the PTRS-8 and the ISI signal is consistent with an amplitude of the preset receiving value of the PTRS, but a phase is opposite to a phase of the preset receiving value. In this way, a PAPR problem caused by the high-energy signal can be alleviated.
  • a signal for example, a PTRS-8
  • an amplitude of the PTRS-6 that needs to be sent by the transmit end may be excessively small.
  • the PTRS sent by the transmit end may be designed as a PTRS-7, so that an amplitude of a signal obtained through addition of the PTRS-7 and the ISI signal is consistent with an amplitude of the preset receiving value of the PTRS, but phases are different. In this way, anti-interference (for example, white noise) performance of the PTRS-8 sent by the transmit end can be improved.
  • a value of the second parameter may be one of the following values: ⁇ 0 ⁇ 2 ⁇ 4 ⁇ 8 3 ⁇ 8 5 ⁇ 8 ⁇ 16 3 ⁇ 16 5 ⁇ 16 7 ⁇ 16 9 ⁇ 16 , or ⁇ ⁇ + 0 ⁇ 2 ⁇ 4 ⁇ 8 3 ⁇ 8 5 ⁇ 8 ⁇ 16 3 ⁇ 16 5 ⁇ 16 7 ⁇ 16 9 ⁇ 16 .
  • the following describes a determining manner of determining the value of the second parameter.
  • the second communication apparatus may preset a value range of the K S ⁇ PTRS ( m ) .
  • a value in the value range is not excessively large to cause a PAPR of the second signal to be large, and is also not excessively small to affect subsequent phase noise calculation.
  • a maximum value in the value range may not be greater than energy of an outermost constellation point, or not greater than unit signal energy (for example, 1), or the maximum value makes time domain signal energy generated at the PTRS not greater than maximum peak signal energy, or the like.
  • a minimum value in the value range may be not less than 3 dB times a signal-to-noise ratio of PTRS signal de-modulation.
  • the second communication apparatus may select one value from a plurality of possible values of the second parameter based on a requirement of the value range.
  • the value of the second parameter can enable the values of the K S ⁇ PTRS ( m ) s to fall within the value range.
  • the method further includes: The first communication apparatus sends fourth indication information to the second communication apparatus, where the fourth indication information indicates the second parameter.
  • the second communication apparatus obtains the fourth indication information sent by the first communication apparatus.
  • the fourth indication message may include an index corresponding to the second parameter.
  • Table 3 shows a possible correspondence between the value of the second parameter and the index according to an embodiment of this application.
  • Table 4 shows a possible correspondence between a value set of the second parameter and the index according to an embodiment of this application.
  • Table 4 Index Value set of the second parameter 1 ⁇ 0, pi ⁇ 2 ⁇ 0, pi/2, pi, 3/2pi ⁇ 3 ⁇ 0, pi/4, pi/2, 3pi/4, pi, 5pi/4, 3pi/2, 7pi/4 ⁇ 4 ⁇ 0, pi/8, 2pi/8, 3pi/8, pi/2, ..., 15pi/8 ⁇ 5 ⁇ 0, pi/16, 2pi/16, 3pi/16, ..., 31pi/16 ⁇ ... ...
  • the second communication apparatus may determine, from the value set of the second parameter based on the calculated phase offset of the phase noise and the value range, the second parameter actually used in the first signal. Then, the final phase noise is determined based on the second parameter. For example, the phase offset of the phase noise calculated by the second communication apparatus is 7pi/6, and the value set of the second parameter is ⁇ 0, pi ⁇ . Because the phase offset caused by the phase noise falls within the range of [-pi/6, pi/6], the second communication apparatus may determine that the second parameter actually used in the first signal is pi, and the phase noise should be pi/6.
  • the second communication apparatus determines the phase noise based on the values of the K PTRSs in the third signal and the preset receiving values of the K PTRSs in the first signal includes: The second communication apparatus determines the phase noise based on the values of the K PTRSs in the third signal, the preset receiving values of the K PTRSs in the first signal, and the second parameter.
  • x ( m ) e j ⁇ m is the PTRS that is actually received by the second communication apparatus and that is affected by the phase noise ( e j ⁇ m ). It may be learned from the above analysis that x(m) should be equal to e j ⁇ m S ( m ). In other words, in Formula 1-7, x ( m ) e j ⁇ m and e j ⁇ m S ( m ) are known, so that the phase noise ( e j ⁇ m ) may be solved.
  • the first parameter indicates a relationship between an amplitude of the actual receiving value of the m th PTRS and that of the preset receiving value of the m th PTRS under the assumed condition that there is no phase noise.
  • the second parameter indicates a relationship between a phase of the actual receiving value of the m th PTRS and that of the preset receiving value of the m th PTRS under the assumed condition that there is no phase noise.
  • the first communication apparatus preprocesses the values of the K PTRSs, so that under the assumed condition that there is no phase noise, the value of the PTRS received by the receive end (that is, the second communication apparatus) may be determined based on the preset receiving value agreed on in advance, the first parameter, and the second parameter, to eliminate the impact of the inter-symbol interference on the value of the PTRS.
  • a sum of the value of the m th PTRS, the value of the first interference, and the value of the second interference is equal to a product of the preset receiving value of the m th PTRS, the first parameter, and a phase offset indicated by the second parameter.
  • the first signal includes N data signals.
  • S ⁇ PTRS ( m ) is the value of the m th PTRS in the first signal
  • ⁇ n 1 N ISI Data
  • n m is the inter-symbol interference, that is, the first interference, generated by the N data signals on the m th PTRS.
  • S(m) is the preset receiving value of the m th PTRS.
  • A is the first parameter, the first parameter is the value related to the amplitude, and A may be a real number.
  • e j ⁇ m is the phase offset indicated by the second parameter.
  • the second parameter is ⁇ m , the second parameter is the value related to the phase, and the second parameter may be an angle value.
  • m is an index value (or referred to as a sequence number, a number, a label, or the like) of the PTRS. It should be noted that the index value of the PTRS may alternatively be designed starting from 0. In this case, a value of the 1 st PTRS is represented as S ⁇ PTRS (0) . In addition, there may be another index value design manner. The design manner of the index value is not limited in this embodiment of this application.
  • values of the N data signals and preset receiving values of the K PTRSs are known. There are K PTRS signals in the first signal. Therefore, there are a total of K unknown numbers S ⁇ PTRS ( m )s and K equations in Formula 1-8. The K equations may be solved to obtain S ⁇ PTRS ( m ), that is, the value of each PTRS.
  • a preset interference value or an interference calculation formula may be further added to a left part of Formula 1-8, to compensate for other interference received by a signal in a transmission process.
  • the method further includes: The first communication apparatus sends fifth indication information to the second communication apparatus, where the fifth indication information indicates the first parameter and the second parameter.
  • the second communication apparatus obtains the fifth indication information sent by the first communication apparatus.
  • the first communication apparatus may alternatively send third indication information and fourth indication information to the second communication apparatus successively or simultaneously.
  • the third indication information and the fourth indication information refer to the descriptions in the foregoing content. Details are not described herein again.
  • the fifth indication message may include an index corresponding to the first parameter and an index corresponding to the second parameter.
  • an index corresponding to the first parameter and an index corresponding to the second parameter.
  • the second communication apparatus determines the phase noise based on the values of the K PTRSs in the third signal and the preset receiving values of the K PTRSs in the first signal includes: The second communication apparatus determines the phase noise based on the values of the K PTRSs in the third signal, the preset receiving values of the K PTRSs in the first signal, the first parameter, and the second parameter.
  • x ( m ) e j ⁇ m is the PTRS that is actually received by the second communication apparatus and that is affected by the phase noise ( e j ⁇ m ). It may be learned from the above analysis that x(m) should be equal to Ae j ⁇ m S ( m ). In other words, in Formula 1-9, x ( m ) e j ⁇ m and Ae j ⁇ m S ( m ) are known, so that the phase noise ( e j ⁇ m ) may be solved.
  • the first communication apparatus and the second communication apparatus may include a hardware structure and a software module, and the foregoing functions are implemented in a form of the hardware structure, the software module, or a combination of the hardware structure and the software module.
  • a specific function in the foregoing functions may be performed by the hardware structure, the software module, or the combination of the hardware structure and the software module.
  • FIG. 12 is a schematic diagram of a structure of a communication apparatus according to an embodiment of this application.
  • the communication apparatus 120 includes a transceiver unit 1201 and a processing unit 1202. The following describes the two units in detail.
  • the transceiver unit 1201 is configured to obtain a first signal, where the first signal includes a data signal and K phase-tracking reference signals PTRSs.
  • a value of an m th PTRS in the K PTRSs is determined based on a value of first interference, a value of second interference, and a preset receiving value of the m th PTRS.
  • the first interference is inter-symbol interference generated by the data signal on the m th PTRS
  • the second interference is inter-symbol interference generated by a PTRS other than the m th PTRS in the K PTRSs on the m th PTRS
  • K and m are positive integers, and 1 ⁇ m ⁇ K.
  • the processing unit 1202 is configured to perform baseband signal processing on the first signal to obtain a second signal.
  • the transceiver unit 1201 is further configured to send the second signal to a second communication apparatus.
  • the value of the first interference and the value of the second interference are determined based on a type of a receiver.
  • the transceiver unit 1201 is further configured to obtain first indication information sent by the second communication apparatus, where the first indication information indicates the type of the receiver.
  • the transceiver unit 1201 is further configured to send second indication information to the second communication apparatus, where the second indication information indicates the type of the receiver.
  • the transceiver unit 1201 is further configured to send third indication information to the second communication apparatus, where the third indication information indicates the first parameter.
  • the transceiver unit 1201 is further configured to send fourth indication information to the second communication apparatus, where the fourth indication information indicates the second parameter.
  • the communication apparatus 120 may be a network device, may be an apparatus in the network device, or may be an apparatus that can be used in matching with the network device.
  • the communication device 1201 may be a terminal device, may be an apparatus in the terminal device, or may be an apparatus that can be used in matching with the terminal device.
  • the units of the communication apparatus 120 shown in FIG. 12 refer to related content about the first communication apparatus in the method embodiment corresponding to FIG. 6 . Details are not described herein again.
  • the units may be implemented by hardware, software, or a combination of software and hardware.
  • functions of the transceiver unit 1201 and the processing unit 1202 in the foregoing content may be implemented by one or more processors in the communication apparatus 120.
  • values of the K PTRSs in the first signal may be preprocessed, so that under an assumed condition that there is no phase noise, a value of a PTRS received by a receive end may be determined based on a preset receiving value agreed on in advance, to eliminate impact of inter-symbol interference on the value of the PTRS. Because the value of the PTRS actually received by the receive end is further affected by the phase noise, the phase noise may be calculated by using an actual receiving value and the preset receiving value of the PTRS.
  • the transceiver unit 1201 is configured to obtain a third signal, where the third signal is a signal obtained through introduction of phase noise into a second signal sent by a first communication apparatus, and the third signal includes a data signal and K phase-tracking reference signals PTRSs.
  • the second signal is a signal obtained through baseband signal processing performed on a first signal.
  • the first signal includes a data signal and K PTRSs.
  • a value of an m th PTRS in the K PTRSs in the first signal is determined based on a value of first interference, a value of second interference, and a preset receiving value of the m th PTRS.
  • the first interference is inter-symbol interference generated by the data signal in the first signal on the m th PTRS
  • the second interference is inter-symbol interference generated by a PTRS other than the m th PTRS in the K PTRSs in the first signal on the m th PTRS
  • K and m are positive integers, and 1 ⁇ m ⁇ K.
  • the processing unit 1202 is configured to determine the phase noise based on values of the K PTRSs in the third signal and preset receiving values of the K PTRSs in the first signal.
  • the processing unit 1202 is further configured to: convert the third signal into a first frequency domain signal; perform channel equalization on the first frequency domain signal to obtain a second frequency domain signal; preprocess the second frequency domain signal based on a receiver, and convert the processed second frequency domain signal into a first time domain signal; and obtain the values of the K PTRSs in the third signal from the first time domain signal.
  • the transceiver unit 1201 is further configured to send first indication information to the first communication apparatus, where the first indication information indicates a type of the receiver.
  • the transceiver unit 1201 is further configured to obtain second indication information sent by the first communication apparatus, where the second indication information indicates a type of the receiver.
  • the processing unit 1202 is further configured to: convert the first frequency domain signal into a second time domain signal; and perform phase noise compensation on the second time domain signal based on the phase noise.
  • the transceiver unit 1201 is further configured to obtain third indication information sent by the first communication apparatus, where the third indication information indicates a first parameter, and the first parameter is a value related to a signal amplitude.
  • the processing unit is specifically configured to determine the phase noise based on the values of the K PTRSs in the third signal, the preset receiving values of the K PTRSs in the first signal, and the first parameter.
  • the transceiver unit 1201 is further configured to obtain fourth indication information sent by the first communication apparatus, where the fourth indication information indicates a second parameter, and the second parameter is a value related to a signal phase.
  • the processing unit is specifically configured to determine the phase noise based on the values of the K PTRSs in the third signal, the preset receiving values of the K PTRSs in the first signal, and the second parameter.
  • the communication apparatus 120 may be a network device, may be an apparatus in the network device, or may be an apparatus that can be used in matching with the network device.
  • the communication device 1201 may be a terminal device, may be an apparatus in the terminal device, or may be an apparatus that can be used in matching with the terminal device.
  • the units of the communication apparatus 120 shown in FIG. 12 refer to related content about the second communication apparatus in the method embodiment corresponding to FIG. 6 . Details are not described herein again.
  • the units may be implemented by hardware, software, or a combination of software and hardware.
  • functions of the transceiver unit 1201 and the processing unit 1202 in the foregoing content may be implemented by one or more processors in the communication apparatus 120.
  • the third signal sent by a transmit end may be obtained, and the phase noise in the third signal may be calculated based on the actual receiving values of the K PTRSs in the third signal and the preset receiving values that are of the K PTRSs in the first signal and that are agreed on in advance.
  • FIG. 13 is a schematic diagram of a structure of another communication apparatus according to an embodiment of this application.
  • the communication apparatus 130 may be configured to implement the method described in the foregoing method embodiments. For details, refer to the descriptions in the foregoing method embodiments.
  • the communication apparatus 130 may include one or more processors 1301.
  • the processor 1301 may be a general-purpose processor, a dedicated processor, or the like.
  • the processor 1301 may be configured to control the communication apparatus (for example, a network device, a chip of the network device, a terminal device, or a chip of the terminal device), execute a software program, and process data of the software program.
  • the communication apparatus 130 may include one or more memories 1302.
  • the memory 1302 may store program code 1304.
  • the program code may be run on the processor 1301, so that the communication apparatus 130 performs the method described in the foregoing method embodiments.
  • the memory 1302 may further store data.
  • the processor 1301 and the memory 1302 may be separately disposed, or may be integrated together.
  • the communication apparatus 130 may further include a transceiver 1305 and an antenna 1306.
  • the transceiver 1305 may be referred to as a transceiver unit, a transceiver machine, a transceiver circuit, or the like, and is configured to implement a transceiver function.
  • the transceiver 1305 may include a receiver and a transmitter.
  • the receiver may be referred to as a receiver machine, a receiver circuit, or the like, and is configured to implement a receiving function.
  • the transmitter may be referred to as a transmitter machine, a transmitter circuit, or the like, and is configured to implement a sending function.
  • the processor 1301 is configured to obtain a first signal through the transceiver 1305, where the first signal includes a data signal and K phase-tracking reference signals PTRSs.
  • a value of an m th PTRS in the K PTRSs is determined based on a value of first interference, a value of second interference, and a preset receiving value of the m th PTRS.
  • the first interference is inter-symbol interference generated by the data signal on the m th PTRS
  • the second interference is inter-symbol interference generated by a PTRS other than the m th PTRS in the K PTRSs on the m th PTRS
  • K and m are positive integers, and 1 ⁇ m ⁇ K.
  • the processor 1301 is further configured to send a second signal to a second communication apparatus through the transceiver 1305, where the second signal is a signal obtained through baseband signal processing performed on the first signal.
  • the value of the first interference and the value of the second interference are determined based on a type of the receiver.
  • the processor 1301 is further configured to invoke the program code 1304 from the memory 1302 to perform the following operation: obtaining first indication information sent by the second communication apparatus, where the first indication information indicates the type of the receiver.
  • the processor 1301 is further configured to invoke the program code 1304 from the memory 1302 to perform the following operation: sending second indication information to the second communication apparatus, where the second indication information indicates the type of the receiver.
  • the processor 1301 is further configured to invoke the program code 1304 from the memory 1302 to perform the following operation: A first communication apparatus sends third indication information to the second communication apparatus, where the third indication information indicates the first parameter.
  • the processor 1301 is further configured to invoke the program code 1304 from the memory 1302 to perform the following operation: sending fourth indication information to the second communication apparatus, where the fourth indication information indicates the second parameter.
  • the communication apparatus 130 may be a network device, may be a terminal device, may be a chip, a chip system, a processor, or the like that supports the network device in implementing the foregoing methods, or may be a chip, a chip system, or a processor, or the like that supports the terminal device in implementing the foregoing methods.
  • values of the K PTRSs in the first signal may be preprocessed, so that under an assumed condition that there is no phase noise, a value of a PTRS received by a receive end may be determined based on a preset receiving value agreed on in advance, to eliminate impact of inter-symbol interference on the value of the PTRS. Because the value of the PTRS actually received by the receive end is further affected by the phase noise, the phase noise may be calculated by using an actual receiving value and the preset receiving value of the PTRS.
  • the processor 1301 is configured to obtain a third signal through the transceiver 1305, where the third signal is a signal obtained through introduction of phase noise into a second signal sent by a first communication apparatus, and the third signal includes a data signal and K phase-tracking reference signals PTRSs.
  • the second signal is a signal obtained through baseband signal processing performed on a first signal
  • the first signal includes a data signal and K PTRSs.
  • a value of an m th PTRS in the K PTRSs in the first signal is determined based on a value of first interference, a value of second interference, and a preset receiving value of the m th PTRS.
  • the first interference is inter-symbol interference generated by the data signal in the first signal on the m th PTRS
  • the second interference is inter-symbol interference generated by a PTRS other than the m th PTRS in the K PTRSs in the first signal on the m th PTRS
  • K and m are positive integers, and 1 ⁇ m ⁇ K.
  • the processor 1301 is further configured to determine the phase noise based on values of the K PTRSs in the third signal and preset receiving values of the K PTRSs in the first signal.
  • the processor 1301 is further configured to invoke the program code 1304 from the memory 1302 to perform the following operations: converting the third signal into a first frequency domain signal; performing channel equalization on the first frequency domain signal to obtain a second frequency domain signal; preprocessing the second frequency domain signal based on the receiver, and converting the processed second frequency domain signal into a first time domain signal; and obtaining the values of the K PTRSs in the third signal from the first time domain signal.
  • the processor 1301 is further configured to invoke the program code 1304 from the memory 1302 to perform the following operation: sending first indication information to the first communication apparatus, where the first indication information indicates a type of the receiver.
  • the processor 1301 is further configured to invoke the program code 1304 from the memory 1302 to perform the following operation: obtaining second indication information sent by the first communication apparatus, where the second indication information indicates a type of the receiver.
  • the processor 1301 is further configured to invoke the program code 1304 from the memory 1302 to perform the following operations: converting the first frequency domain signal into a second time domain signal; and performing phase noise compensation on the second time domain signal based on the phase noise.
  • the processor 1301 is further configured to invoke the program code 1304 from the memory 1302 to perform the following operations: receiving third indication information sent by the first communication apparatus, where the third indication information indicates a first parameter, and the first parameter is a value related to a signal amplitude; and determining the phase noise based on the values of the K PTRSs in the third signal, the preset receiving values of the K PTRSs in the first signal, and the first parameter.
  • the processor 1301 is further configured to invoke the program code 1304 from the memory 1302 to perform the following operations: receiving fourth indication information sent by the first communication apparatus, where the fourth indication information indicates a second parameter, and the second parameter is a value related to a signal phase; and determining the phase noise based on the values of the K PTRSs in the third signal, the preset receiving values of the K PTRSs in the first signal, and the second parameter.
  • the communication apparatus 130 may be a network device, may be a terminal device, may be a chip, a chip system, a processor, or the like that supports the network device in implementing the foregoing methods, or may be a chip, a chip system, or a processor, or the like that supports the terminal device in implementing the foregoing methods.
  • the third signal sent by a transmit end may be obtained, and the phase noise in the third signal may be calculated based on the actual receiving values of the K PTRSs in the third signal and the preset receiving values that are of the K PTRSs in the first signal and that are agreed on in advance.
  • the transceiver may be a transceiver circuit, an interface, or an interface circuit.
  • the transceiver circuit, the interface, or the interface circuit configured to implement receiving and sending functions may be separated, or may be integrated together.
  • the transceiver circuit, the interface, or the interface circuit may be configured to read and write code or data.
  • the transceiver circuit, the interface, or the interface circuit may be configured to transmit or transfer a signal.
  • the processor 1301 may store program code 1303.
  • the communication apparatus 130 is enabled to perform the method described in the foregoing method embodiments.
  • the program code 1303 may be fixed in the processor 1301, and in this case, the processor 1301 may be implemented by hardware.
  • the communication apparatus 130 may include a circuit, and the circuit may implement a sending, receiving, or communication function in the foregoing method embodiments.
  • the processor and the transceiver described in this application may be implemented on an integrated circuit (integrated circuit, IC), an analog IC, a radio frequency integrated circuit RFIC, a mixed-signal IC, an application-specific integrated circuit (application-specific integrated circuit, ASIC), a printed circuit board (printed circuit board, PCB), an electronic device, or the like.
  • integrated circuit integrated circuit, IC
  • analog IC analog IC
  • radio frequency integrated circuit RFIC radio frequency integrated circuit
  • RFIC radio frequency integrated circuit
  • mixed-signal IC mixed-signal IC
  • ASIC application-specific integrated circuit
  • PCB printed circuit board
  • an electronic device or the like.
  • the communication apparatus described in the foregoing embodiments may be a network device or a terminal device.
  • a scope of the communication apparatus described in this application is not limited thereto, and the structure of the communication apparatus may not be limited by FIG. 13 .
  • the communication apparatus may be an independent device or may be a part of a large device.
  • the communication apparatus may be the following:
  • the communication apparatus may be a chip or a chip system
  • the chip 140 shown in FIG. 14 includes a logic circuit 1401 and an input/output interface 1402. There may be one or more logic circuits 1401 and there may be a plurality of input/output interfaces 1402.
  • the input/output interface 1402 is configured to input a first signal.
  • the input/output interface 1402 is further configured to output a second signal.
  • the logic circuit 1401 is configured to process the first signal and the second signal, and perform the following operation: obtaining the first signal through the input/output interface 1402, where the first signal includes a data signal and K phase-tracking reference signals PTRSs.
  • a value of an m th PTRS in the K PTRSs is determined based on a value of first interference, a value of second interference, and a preset receiving value of the m th PTRS.
  • the first interference is inter-symbol interference generated by the data signal on the m th PTRS
  • the second interference is inter-symbol interference generated by a PTRS other than the m th PTRS in the K PTRSs on the m th PTRS
  • K and m are positive integers, and 1 ⁇ m ⁇ K.
  • the second signal is sent to a second communication apparatus through the input/output interface 1402, where the second signal is a signal obtained through baseband signal processing performed on the first signal.
  • the input/output interface 1402 is configured to input a third signal.
  • the logic circuit 1401 is configured to process the third signal, and perform the following operation: obtaining the third signal through the input/output interface 1402, where the third signal is a signal obtained through introduction of phase noise into a second signal sent by a first communication apparatus, and the third signal includes a data signal and K phase-tracking reference signals PTRSs.
  • the second signal is a signal obtained through baseband signal processing performed on a first signal, and the first signal includes a data signal and K PTRSs.
  • a value of an m th PTRS in the K PTRSs in the first signal is determined based on a value of first interference, a value of second interference, and a preset receiving value of the m th PTRS.
  • the first interference is inter-symbol interference generated by the data signal in the first signal on the m th PTRS
  • the second interference is inter-symbol interference generated by a PTRS other than the m th PTRS in the K PTRSs in the first signal on the m th PTRS
  • K and m are positive integers, and 1 ⁇ m ⁇ K.
  • the phase noise is determined based on values of the K PTRSs in the third signal and preset receiving values of the K PTRSs in the first signal.
  • This application further provides a computer-readable storage medium storing a computer program.
  • the computer-readable storage medium When the computer-readable storage medium is executed by a computer, functions of any one of the foregoing method embodiments are implemented.
  • This application further provides a computer program product.
  • the computer program product is executed by a computer, functions of any one of the foregoing method embodiments are implemented.
  • All or some of the foregoing embodiments may be implemented by using software, hardware, firmware, or any combination thereof.
  • software is used to implement embodiments, all or some of the embodiments may be implemented in a form of a computer program product.
  • the computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the procedures or functions according to embodiments of this application are all or partially generated.
  • the computer may be a general-purpose computer, a dedicated computer, a computer network, or another programmable apparatus.
  • the computer instructions may be stored in a computer-readable storage medium or may be transmitted from a computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center to another website, computer, server, or data center in a wired (for example, a coaxial cable, an optical fiber, or a digital subscriber line (digital subscriber line, DSL)) or wireless (for example, infrared, radio, or microwave) manner.
  • the computer-readable storage medium may be any usable medium accessible by the computer, or a data storage device, for example, a server or a data center, integrating one or more usable media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, or a magnetic tape), an optical medium (for example, a high-density digital video disc (digital video disc, DVD)), a semiconductor medium (for example, a solid-state drive (solid-state drive, SSD)), or the like.
  • a magnetic medium for example, a floppy disk, a hard disk, or a magnetic tape
  • an optical medium for example, a high-density digital video disc (digital video disc, DVD)
  • a semiconductor medium for example, a solid-state drive (solid-state drive, SSD)
  • Correspondences shown in the tables in this application may be configured, or may be predefined. Values of information in the tables are merely examples, and may be configured as other values. This is not limited in this application. When the correspondences between the information and parameters are configured, not all the correspondences shown in the tables need to be configured. For example, in the table in this application, correspondences shown in some rows may alternatively not be configured. For another example, proper deformations and adjustments such as splitting and combination may be performed based on the foregoing tables. Names of parameters shown in headings of the foregoing tables may alternatively be other names that can be understood by the communication apparatus, and values or representation manners of the parameters may alternatively be other values or representation manners that can be understood by the communication apparatus.
  • another data structure for example, an array, a queue, a container, a stack, a linear table, a pointer, a linked list, a tree, a graph, a structure, a class, a pile, or a hash table, may alternatively be used.
  • Predefine in this application may be understood as “define”, “predefine”, “store”, “pre-store”, “pre-negotiate”, “pre-configure”, “solidify”, or “pre-burn”.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Noise Elimination (AREA)
EP22778816.3A 2021-03-30 2022-03-26 METHOD FOR DETERMINING PHASE NOISE AND ASSOCIATED DEVICE Pending EP4311174A4 (en)

Applications Claiming Priority (2)

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CN202110341555.2A CN115150234A (zh) 2021-03-30 2021-03-30 一种相位噪声的确定方法及相关装置
PCT/CN2022/083220 WO2022206634A1 (zh) 2021-03-30 2022-03-26 一种相位噪声的确定方法及相关装置

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CN101222462A (zh) * 2007-01-10 2008-07-16 英华达(上海)电子有限公司 准静态信道均衡方法、系统和装置
CN105577598A (zh) * 2014-10-17 2016-05-11 中兴通讯股份有限公司 在干扰条件下的lte上行系统的信号检测方法和装置
CN104618280B (zh) * 2015-02-02 2018-03-09 华为技术有限公司 消除码间串扰的方法及一种判决反馈序列预测器
CN106330795B (zh) * 2015-06-30 2020-01-07 展讯通信（上海）有限公司 移动终端及其接收信号处理方法及装置
KR102435821B1 (ko) * 2015-10-29 2022-08-25 삼성전자주식회사 통신 시스템에서 데이터를 송수신하는 장치 및 방법
GB2562462B (en) * 2017-03-24 2021-11-17 Samsung Electronics Co Ltd Phase tracking reference signal
CN114629762A (zh) * 2020-12-14 2022-06-14 华为技术有限公司 一种相位噪声的抑制方法及相关装置

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EP4311174A4 (en) 2024-08-28
CN115150234A (zh) 2022-10-04

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